Sectional mold.



PATENTED' SEPT. 17, 1907.

W. M. DEAN. 'SEGTIONAL IMOLD- APPLICATION FILED n.1, 1907.

WALTER M. DEAN, OF EVANSTON, ILLINOIS.

SE CTION AL MOLD Specification of Letters Patent.

Patented Sept. 17, 1907.

Application filed April 1,1907. Serial NO- 365,898.

To all whom it may concern:

Be it known that I, WALTER M. DEAl I, a citizen of the United States, residing at Evanston, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement ill-Sectional Molds, of which the following is a specification.

My invention relates to sectional molds and the object of the invention is to provide a sectional mold having efficient means for releasably holding the parts together.

Although my invention is adapted for molds and cores of various forms and for use for various purposes, I have chosen to illustrate it in a form adapted for the manufacture of seamless rubber water bottles, and in the accompanying drawings,

Figures 1 & 2 are longitudinal sections of the mold, Fig. 2 being taken on a plane transverse to the plane of Fig. 1. Fig. 3 is a fragmentary sectional view taken on line 33,. Fig. 1. Fig. 4 is a perspective view of the cam or wedge block, and Fig. 5 is a fragmentary view of an alternative form of operating screw.

Similar numerals refer to'similar parts throughout the several views.

The mold may consist of any number of sections, the present one having a central section 10, a section 11 on each side thereof, an outer section 12 at each edge of the mold and two intermediate sections 13 located between the sections 11 and 12. The present mold therefore consists of nine separable sections which when assembled correspond in size and shape to the inside of the water bottle to be made. In order to assist in holding the parts in their proper relative positi'ons, the sections 11 and 13 are provided with dowel pins 14 adapted to fit into the adjacent sections as illustrated in Fig. 1. The central section 10 instead of having dowel pins has grooves 15 in its vertical edges to receive the tongues 16 on sections 11 as best shown in Fig. 3. This tongue and groove construction assists in holding the parts together and at the same time permits the central section to be drawn vertically upwards and out from the bottle after the same has been formed around the mold. At the top, the central section is provided with a head 17 adapted to form the mouth piece of the bottle.

Mounted near the upper portion of section 1.0 is a nut 18 which receives a screw 19 extending centrally and longitudinally in section 10. By preference the upper end of this screw projects beyond the top of head 17 and terminates in a ring or hook 20 whereby the screw may be rotated and whereby the central section 12 may be withdrawn from the mold after the bottle is formed. This ring or hook also affords means whereby the mold may be hung up while the rubber is solidifying around it as hereinafter explained. The

form of the upper portion of this screw, however, is not essential and in some cases it may be desirable to em ploy the form shown in Fig. 5 in which the screw 19 is provided with a head 20 adapted to enter the socket of a key 21. In this last described form the head 17 may be recessed at l7 to accommodate the socket of the key in case the said screw does not project above the top. of head 17.

At the lower or inner end of screw 19 is a cam or wedge block 22 which is vertically slidable in section 10, having flanges 22 which engage the lateral edges of the guides 23 formed upon section 10. Said cam is operated by means of screw 19 and I prefer to make the connection between said block 22 and screw 19 by forming a head 19 at the lower end of said screw which fits into a chamber 22 formed in the upper portion of said block. with the chamber 22 is narrow enough to retain the head 19 of the screw. As a result of this construction the screw may rotate independently of the block but any vertical movement of said screw will be imparted to said block. As the nut 18 is stationary in moldsection 10, a rotation of screw 20 will cause the raising or lowering of block 22 in said mold-section.

It will be noted that by employing a screw for operating block 22 the means for holding the mold sections together are self locking and when the screw has once been turned down hard to set position the parts will remain firmly held in proximity to each other with no danger of accidental release.

At the lower portion of block 22 are cam surfaces 22 adapted to cooperate with the ends 24* of the tie rods 24. Said tie rods are pivoted by means of pins 25 to the outer mold-sections 12 as best shown in Fig. 1. In order to permit the rods 24 to swing to the dotted position shown in Fig. l for permitting the inner extre1nities of said rods to move out of the path of the central section 10 when the latter is being withdrawn from the formed bottle, the mold-sections are chambered at 26 above said rods. The form of this chamber, however, is immaterial provided only that it is of suflicient extent to permit the requisite amount of movement of the rods. In order to prevent said rods from receding from block 22 when the latter is descending onto the ends 24, shoulders 10 are formed upon one or more of the mold-sections as illustrated in Figs. 1 and 2.

I will now describe the operation of my mold in connection with the process of forming a seamless rubber water bottle or bag. The parts are assembled in the relative positions shown in full lines in Figs. 1 and 2. The parts may be drawn together as tightly as is desired by rotating screw 20 and thereby forcing the wedge block 22 down tight against the cam surfaces 24 of the rods 24. By referring to Fig. 1 it will be The slot or opening which communicates seen that inasmuch as the surfaces 22 of block 22 are I beveled, that is, are oblique to the path of said block, a cam or wedging action is set up and the parts may be brought tightly together without requiring the operator to exert much i'orce upon the screw 20. When the mold has thus been secured together the whole mold up to the top of head 17 is dipped into a bath of semi-fluid rubber, either pure or mixed with the desired ingredients and after immersion the whole is Withdrawn for a period sullicient to permit the hardening or setting of such amount of rubber as has adhered to the mold. Alter this first layer of rubber has become sulliciently hardened and set, the whole is dipped again and the operation is repeated until the deposit formed upon the outside of the mold is of the desired thickness. The rubber deposit is then vulcanized by any suitable process. It then becomes necessary to remove the mold through the neck of the bottle; this is done by backing off the screw 19 and consequently raising block 20 until the latter clears the inner extremities of rods 24. A gentle upward pull is then exerted upon screw 19 and the mouth of the bottle is stretched slightly to permit the extraction of section 10. As section 10 moves upward the shoulder 10, which contracts the lower edge of rods 24, causes said rods to swing upward to the dotted position shown in Fig. 1 in which position the inner extremities of said rods pass out of the path of section 10 and permit the latter to be withdrawn from the bottle. After the central section has been removed in the manner just explained, one of the sections 11 is slipped sidewise until it is opposite to the mouth of the bottle, when it also may be withdrawn. The remaining sections are withdrawn from the bottle in the same manner.

By employing a mold of this construction a seamless receptacle may be formed and the sections may be made of such size and shape as to admit of their being withdrawn even it the formed product be glass, metal, or other unyielding substance.

Although I have shown and described a mold which is intended to form the inside of the object to be produced, it will be apparent to those skilled in the art that the form and proportion of the parts may be greatly varied without departing from the spirit of the invention.

What I claim as new and desire to secure by Letters- Patent is:

1. In combination, a plurality of separable mold sections including a central mold section and other mold sections flanking the same, and means for detachably attaching said sections together said attaching means including tie members pivoted to the outer mold sections and means mounted on the central mold section for engaging said tie members for holding the parts together said central section being slidable along its neighbor for withdrawal and said flanking sections being chambered to permit movement of said tie members about their pivots for permitting said tie members to clear said central section when the latter is withdrawn from its neighbors.

2. In combination, a plurality of separable mold sections, a holding member pivoted to one of said sections, a second holding member mounted on another of said sections and adapted to cooperate with said first holding member for holding the mold sections together, one of said two holding members having a cam surface for acting upon the other member for forcing the parts together, a stop on one of said members for limiting the movement of said pivoted member, and hand operated means for controlling the holding member which cooperates with said pivoted holding member.

3. In combination, a plurality of separable mold-sections, a tie rod pivoted to one of them, a block mounted in another of them and adapted to engage said tie rod and a screw for operating said block, there being a cam suriacc between said rod and said block on one of them for drawing the mold sections tightly together.

4. In a sectional mold, the combination of a plurality of separable mold sections adapted to lie side by side, a tie rod pivoted to an outside section, a cam mounted in another mold section and adapted to engage said tie rod, and means i'or operating said cam, said rod when in set position extending into the cam-carrying section and the mold sections being chambered 'to permit the tie rod to swing clear of said cam-carrying section to permit the latter to be slid lengthwise of the section which carries said tie rod.

5. In a sectional mold, the combination of a plurality of separable mold sections adapted to lie side by side, a tie rod pivoted to an outside section, a cam mounted in another mold section and adapted to engage said tie rod, said cam-carrying section and the section next adjacent thereto being correspondingly tongued and grooved to prevent lateral but permit longitudinal displacement rela tively to each other and means for operating said cam, said rod when in set position extending into the cam-carrying section and the mold sections being chambered to permit the tie rod to swing clear of said cam-carrying section to permit the latter to be slid lenghtwise of the section which carries said tie rod.

6. In a sectional mold, the combination of a plurality of separable mold sections, a cooperating block and tie red one of which has a cam surface at the point of contact with the other, said block being slidingly mounted in one or said mold sections and said tie rod being connected to another of said mold sections, and a screw mounted in the same section as the block and having a head thereon for operating said block, said block having a narrow mouthed chamber for retaining the screw head but permitting rotation of said screw.

7. In a sectional mold, the combination of a plurality of mold sections, a cooperating block and tie rod one of which has a cam surface at the point of contact with the other, said rod being pivoted to one section and said block being slidingly mounted in another mold section, and a screw mounted in the same section as the block for operating it, said screw projecting beyond the mold section in which it is mounted for convenience in rotating it.

8. In a sectional mold, the combination of a plurality of mold sections, a cooperating block and tie rod one of which has a cam surface at the point of contact with the other, said rod being pivoted to one section and, said block being slidingly mounted in another mold section, and a screw mounted in the same section as the block for operating it, said screw projecting beyond the mold section in which it is mounted and having a hook formed in said projecting portion for suspending the mold.

i). In a sectional mold, the combination of a central mold section, two flanking mold sections having a tongue and groove connection therewith which prevents lateral but permits longitudinal displacement of the central section relatively to the flanking sections, and means including a cam for releasably drawing the flanking sections tight against the central section.

10. In a sectional mold, a central mold section, a plurality or outer mold sections and a plurality of intermediate mold sections, said central section having a tongue and groove contact with its neighboring sections, and the remaining sections being dowel-pinned together; in com bination with tie rods connected to the outer sections and means mounted on said central section and adapted to engage said tie rods for releasably drawing the mold sections toward each other.

11. In a sectional mold, a central mold section, a pinrality of outer mold sections and a plurality of intermediate mold sections, said central section having a tongue and groove contact with its neighboring sections; in combination with means for releasably drawing the parts to- 'ward each other, said drawing means being inclosed within the mold sections and operated from the outside thereof, and comprising tie rods connected to the outer mold sections and means mounted on the central mold section for engaging said tie rods.

12. In a sectional mold, a central mold section, a plurality of outer mold sections and a plurality of intermediate mold sections, said central section having a tongue and groove contact with its neighboring sections, and the remaining sections being dowel-pinned together; in combination with means for releasably drawing the parts to ward each other, said drawing means including members pivoted to the outer mold sections and extending through from the outer to the central section and a screw controlled member slidingly mounted in said central section for engaging said pivoted drawing members.

In witness whereof, I have hereunto subscribed my name in the presence of two witnesses.

WALTER M. DEAN. Witnesses IIOWARD M. COX, DWIGHT B. CHEEVER. 

